Anime Series - The series follows Koichi, a Japanese schoolboy who learns he is the reincarnation of the alien entity "Babel". As such, Koichi is entrusted with Babel's powers and joined by three protectors: Rodem, a shape-shifting black panther; Ropross, a Pteradactyl-like flying creature; and Poseidon, a giant robot that always rises from the depth of the ocean when summoned.
http://www.theanimenetwork.com/Shows/Babel-II-Beyond-Infinity