Crab

Crabs were a type of crustacean found on Earth and other planets.

Giant crabs lived on the island of Salutua. (MA: The Eye of the Giant)

Charlie Johns was a crab fisherman in a village on the Cornish coast. (TN: Rip Tide)

The Doctor, John and Gillian encountered a large crab in a sea on a desolate planet. It attacked John, but the Doctor drove it off with his electroliser. (TVC: Shark Bait)

The Macra appeared to have evolved from crabs or crab-like creatures. (DW: The Macra Terror)

Sixth Doctor and Peri Brown encountered intelligent genetically-engineered crabs on an unnamed planet. (TN: Shell Shock)

The Doctor, Charley Pollard and C'rizz encountered giant crabs on an island in the Divergent Universe. (BFA: The Next Life)

The Doctor and Rose Tyler once fought off luminous sucker crabs on Praxos 9. (DWAM: Blood and Tears)