Thwomp Caverns is the interior location of Thwomp Volcano in Mario & Luigi: Partners in Time. Mario and Luigi can enter here by riding down on Mr. Thwomp. Bowser and his infant self, Baby Bowser, are fought as bosses here.

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Characters	Protagonists	Mario • Luigi • Baby Mario • Baby Luigi
	Antagonists	Elder Princess Shroob • Princess Shroob
	Other	Baby Peach • Bowser Baddies crew • Dr. Toad • Fawful • Gramma Red and Gramma Green • Hollijolli Mayor • Kylie Koopa • Monty Mole • Mr. Thwomp • Princess Peach • Professor E. Gadd (past) • Star Gate • Stuffwell • Thwomp Bros. • Thwomp Elevator • Toad • Toads • Toadbert • Toadiko • Toadsworth • Toadsworth the Younger • Yoob • Yoshi • Yoshis
Locations	Locations	Baby Bowser's Castle • Fawful's Bean 'n' Badge • Gramma's Place • Gritzy Caves • Gritzy Desert • Hollijolli Village • Koopaseum • Monty Mart • Princess Peach's Castle • Princess Peach's Castle Dungeon • Princess Peach's room • Shroob Castle • Shroob Mother Ship • Shroob Planet • Shroom Shop • Star Hill • Star Shrine • Thwomp Caverns • Thwomp Volcano • Toad Town • Toadwood Forest • Vim Factory • Yoob's Belly • Yoshi's Island
Bosses	Bosses	Baby Bowser • Bowser • Commander Shroob • Elder Princess Shroob • Elder Shrooboid • Hammer Bros. • Junior Shrooboid • Kamek • Mrs. Thwomp • Petey Piranha • Princess Shroob • Shrooboid Brat • Shrowser • Sunnycide • Swiggler
Enemies	Enemies	Blazing Shroob • Bob-omb • Boo • Boo Guy • Boom Guy • Bully • Coconutter • Dark Boo • Dr. Shroob • Dry Bones • Elasto-Piranha • Elite Boom Guy • Fly Guy • Ghoul Guy • Gnarantula • Gold Koopeleon • Goomba • Guardian Shroob • Handfake • Intern Shroob • Koopeleon • Lakitufo • Lethal Bob-omb • Love Bubble • Micro Goomba • Pidgit • Piranha Planet • Pokey • RC Shroober • Red Coconutter • Shroid • Shroob • Shroob Chomp • Shrooba Diver • Shrooblet • Shroob-omb • Shroob Rex • Shroob UFO • Shroobsworth • Skellokey • Snifaro • Snoozorb • Soul Bubble • Spiny Shroopa • Support Shroob • Tanoomba • Tashrooba • Thwack • Thwack Totem • Wonder Thwack
Items	Consumables	1-Up Mushroom • 1-Up Super • 5 Gold Coin • 10 Gold Coin • 20 Coin • 100 Coin • Bean • Coin • Blue Pepper • Green Pepper • Max Mushroom • Mushroom • Mushroom Drop • Red Pepper • Refreshing Herb • Super Mushroom • Super Drop • Ultra Mushroom • Ultra Drop
	Blocks	4-Bros. Random Block • Adult Shine Block • Aurora Block • Command Block • Control Block • Empty Block • L Block • Laser Block • M Block • Recovery Block • Save Album • Simu-Block • Small Shine Block • Warp Block
	Bros. Items	Bros. Flower • Cannonballer • Copy Flower • Green Shell • Ice Flower • Mix Flower • Pocket Chomp • Red Shell • Smash Egg • Trampoline
	Other	2-Person Panel • 4-Person Panel • Cobalt Star • Chomp Rock • DS Time Radar • E. Gadd's time machine • Fireball • Hydrogush 4000 • Iceball • Koopa Cannon • Koopa Clown Car • Koopa Cruiser • Pipe • Shroob Blaster • Shroob Missile • Shroob Mushroom • Shroob UFO • Spike Ball • Time hole • Toadbert's Drawing • Treasure Chest Block • Whirlwind
Miscellaneous	Stats	Defense • Experience Point • Heart Point • Power • Speed • Stache
	Status	Burn • DEF-Down • DEF-Up • Dizzy • Level up • Poison • POW-Down • POW-Up • SPD-Down • SPD-Up • Trip
	Moves	Baby Cakes • Baby Drill • Baby Pump • Baby Spin • Baby Toss • Bros. Ball • Flee • Hammer • Jump • Piggyback Jump • Spin Jump
	Other	Mario & Luigi: Partners in Time/Gallery