Darkseid's Arrival:
- Darkseid, the powerful ruler of Apokolips, arrives on Earth, posing a significant threat to the planet. Clark and his allies must find a way to defeat Darkseid and prevent the destruction of Earth.
The Legion of Super-Heroes:
- Clark encounters the Legion of Super-Heroes, a group of heroes from the future who come to Earth to help him prepare for upcoming threats. The Legion members include Supergirl, Brainiac 5, Lightning Lad, Saturn Girl, and more.
Clark and Lois's Relationship:
- Clark and Lois Lane's relationship continues to develop, and they face challenges as they try to balance their personal lives with their superhero responsibilities.
Oliver Queen's Return:
- Oliver Queen, also known as Green Arrow, returns to Smallville after a long absence. He helps Clark and his allies fight against Darkseid and other threats.
The Death of Lex Luthor:
- Lex Luthor, Clark's archenemy, meets his demise in season 10. This event has significant consequences for Clark and the other characters.
The Fortress of Solitude:
- Clark discovers the Fortress of Solitude, a hidden Arctic stronghold that was created by his Kryptonian father, Jor-El. The fortress serves as a place of learning and reflection for Clark as he prepares to become Superman.
Alternate Timelines:
- Clark experiences visions of alternate timelines and potential futures, including one where he becomes a ruthless dictator. These visions challenge Clark's understanding of his destiny and push him to make crucial choices.
Superman's Costume:
- Clark finally dons the iconic Superman costume in the season finale, symbolizing his transformation into the full-fledged Man of Steel.
Overall, season 10 of Smallville focuses on Clark Kent's journey toward becoming Superman, his battles against Darkseid and other villains, and the emotional and personal struggles he faces as he embraces his destiny as a superhero.