Superman Unbound d20 conversion:

 *Size and Type:* 
Unchanged (can only be added to a normal human subtype)

 *Initiative: *
+2 (derived from improved stats.)

*Speed:* 
+30' speed per 5SA. Gain flight at level 40SA of 300' that increases by +30' per 5SA above 40SA.

*Armor Class:*
Unchanged.

*Base Attack/Grapple:*
+0/+3 (derived from increased +6 base strength. Also has "Super Strength, but this does not affect your attack modifiers.)

*Attack and Full Attack:*
no change.

*Damage:*
5d4+1d4 per 5SA (Maximum of 25d4) +3 (derived from enhanced strength.)

*Space/Reach:*
No change.

*Special Attacks:*
Cold breath, Heat Vision, Area Flurry of attacks.

*Special Qualities:*
Physical Damage Reduction, 10/magic. Increases by 2 per 5SA. Fire, Cold, Energy, Acid reduction of 10, increasing per 2 every 5SA points.
Penalty to Magic of -2, as they seem to have a weakness to magic. Super Strength Lifting 10 times normal strenth per 5SA.

*Abilities:*
+6 STR, +4 DEX, +4 CON, +4 INT.

*Environment:*
Typical human.

*Organization:*
Varied.

*Challenge Rating:* 
+5 and upwards.

*Level Adjustment:*
+8 and upwards.

Specific version of a 5SA citizen.

*Acquired Template:*
Superman Aura (5SA Minor)

*Size and Type:*
Unchanged (can only be added to a normal human subtype)

*Hit Dice and Hit Points:*
+3HD and all hit dice increase by one category.

*Initiative: *
+2 (derived from improved stats.)

*Speed:*
+30' speed.

*Armor Class:*
Unchanged.

*Base Attack/Grapple:*
+0/+3 (derived from increased +6 base strength. Alsohas "Super Strength, but this does not affect your attack modifiers.)

*Attack and Full Attack:*
no change.

*Damage:*
6d4+3

*Space/Reach:*
No change.

*Special Attacks:*
None

*Special Qualities:*
Physical Damage Reduction, 10/magic. Fire, Cold, Energy, Acid reduction of 10.
Penalty to Magic of –2. Super Strength Lifting 10 times normal strenth  per 5SA.

*Abilities:*
+6 STR, +4 DEX, +4 CON, +4 INT.

*Environment:*
Typical human.

*Organization:*
Varied.

*Challenge Rating:*
+5

*Level Adjustment:*
+8