Metalions

Elon O'Connor, boy genius, tests out the Eco Team's new jet prototype when things take a turn for the worse; Sigma Corp. announces their latest earth-destroying venture; a surprise from Elon's long-lost grandfather hides in plain sight.

The first of Theodore's adventures is revealed, along with the identity of his research partner; Harrison and the others strategize to fight Sigma Corp.; separated from the others, Elon discovers a lone otherworldly being.

Fascinated by his abilities, Elon tries to persuade Leo to stay by his side; Leonard, the director of Sigma Corp., detects a strange energy signature and launches a new mission; Elon faces the ultimate test of smarts and strength.

Elon and the Eco Team fly to England as part of their environmental awareness tour, but Elon has an ulterior motive; with Sigma nearby, a showdown pits these foes against one another; someone from Leo's past lurks in the shadows.